How does this approach help you?
You invest with the aim of growing your assets over time. If your portfolio experiences a fall in value, you may end up having less than you invested, which means that you have not achieved the first aim of investment, to grow your wealth.
In addition the larger the size of the fall (draw-down), the larger the required return to get your portfolio back to where it was prior to the fall. A draw-down of -
50%
will require a
+100%
return. This level of return may not actually be possible, or may take many years to achieve. If your portfolio is paying an income stream or a lump sum (possibly for a home deposit), then combined with the fall (draw-down) in the value of your portfolio, your portfolio may never recover its’ value, as the available assets exposed to the recovery in prices is reduced.